Influence of chopped laser light onto the electronic transport through atomic-sized contacts

Details Influence of chopped laser light onto the electronic transport through atomic-sized contacts Influence of chopped laser light onto the electronic transport through atomic-sized contacts

2006-12-05

arxiv.org/abs/cond-mat/0612117v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages with 7 figures; conference contribution on the 9th near field optics conference 2006 in Lausanne, Switzerland; accept

Scientific paper

10.1103/PhysRevLett.99.086801

This article reports on the influence of laser irradiation onto the electrical conductance of gold nanocontacts established with the mechanically controllable breakjunction technique (MCB). We concentrate here on the study of reversible conductance changes which can be as high as 200%. We investigate the dependence on the initial conductance of the contacts, the wavelength, the intensity and position of the laser spot with respect to the sample. Under most conditions an enhancement of the conductance is observed. We discuss several physical mechanisms which might contribute to the observed effect including thermal expansion, rectification and photon-assisted transport. We conclude that thermal expansion is not the dominating one.

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